Hibernate Criteria Expression (eq)
In this section, you will learn to use the "eq"
method. This is one of the most important method that is used to apply
an "equal" constraint to the named property.
Expressions: The
Hibernate Criteria API supports a rich set of comparison operators. Some
standard SQL operators are =, <, ?, >, ?. That supports eq() method
in Expression class.
In this tutorial, "Eq" is used with the
date object. It takes two parameters e.g. eq("property_name",Object
val).
Table Name: insurance
| ID |
insurance_name |
invested_amount |
investement_date |
| 2 |
Life Insurance |
25000 |
0000-00-00 00:00:00 |
| 1 |
Givan Dhara |
20000 |
2007-07-30 17:29:05 |
| 3 |
Life Insurance |
500 |
2005-10-15 00:00:00 |
| 4 |
Car Insurance |
2500 |
2005-01-01 00:00:00 |
| 5 |
Dental Insurance |
500 |
2004-01-01 00:00:00 |
| 6 |
Life Insurance |
900 |
2003-01-01 00:00:00 |
| 7 |
Travel Insurance |
2000 |
2005-02-02 00:00:00 |
Here is the code of the class using "eq"
Expression :
package roseindia.tutorial.hibernate;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.criterion.Expression;
public class HibernateCriteriaQueryExpressionEq {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Session sess = null;
try{
SessionFactory fact = new
Configuration().configure().buildSessionFactory();
sess = fact.openSession();
Criteria crit =
sess.createCriteria(Insurance.class);
DateFormat format =
new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
Date date =
(Date)format.parse("2005-01-01 00:00:00");
crit.add(Expression.eq("
investementDate",date));
List list = crit.list();
for(Iterator it =
list.iterator();it.hasNext();){
Insurance ins =
(Insurance)it.next();
System.out.println("
Id: " + ins.getLngInsuranceId());
System.out.println("
Insurance Name: " + ins.getInsuranceName());
System.out.println("
Insurance Amount: " + ins.getInvestementAmount());
System.out.println("
Investement Date: " + ins.getInvestementDate());
}
sess.clear();
}
catch(Exception e){
System.out.println(e.getMessage());
}
}
}
|
Download
this Code.
Output:
| log4j:WARN No appenders
could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Hibernate: select this_.ID as ID0_0_,
this_.insurance_name as insurance2_0_0_, this_.invested_amount as
invested3_0_0_, this_.investement_date as investem4_0_0_ from insurance
this_ where this_.investement_date=?
Id: 4
Insurance Name: Car Insurance
Insurance Amount: 2500
Investement Date: 2005-01-01
00:00:00.0
|
|
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